>PAT is gross & ugly, but is driven by the inability to have the
>"smtp" port number for one DNS name be different than the "smtp" 
>port number for another host name from the perspective of a host 
>doing a getservbyname(3) call.   Otherwise, you might see something
>like 
>	zembu.com.     	     IN MX 1  mail.zembu.com.
>	mail.zembu.com.      IN  A    1.2.3.4
>	smtp.mail.zembu.com. IN PORT  25
>
>It would be OK to have such an RR simply override a local default
>(e.g., one's /etc/services file's contents), but no work has been
>done on virtualizing this part of a connection name in EITHER
>IPv4 or IPv6 (which is inherently hostile to separating name from location).

actually...i think it would be more like this:

	$ORIGIN zembu.com.
	@                    IN MX  1  mail
	mail                 IN A   1.2.3.4
	_smtp._tcp.mail      IN SRV 1 1 25 mail

where the 25 in the SRV record could be changed if you liked.  hey!
then you could do port remapping in the outside of the nat box to 25
on the inside.  :)

-- 
|-----< "CODE WARRIOR" >-----|
codewarrior@daemon.org             * "ah!  i see you have the internet
twofsonet@graffiti.com (Andrew Brown)                that goes *ping*!"
andrew@crossbar.com       * "information is power -- share the wealth."